Given squeeze is frozen, we should now go the conservative way, that is
reverting back to cons25. We will try to have another way to get
debian-installer display UTF-8 (maybe defaulting to the graphical
installer, not yet tested on GNU/kFreeBSD), and it is possible to do
that far later in the freeze process.
I have tried to do the fix myself by reverting only TEKEN_XTERM, but I
still get the problem. Given I am now travelling, I can't test that
anymore.